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Amiga Plus 2004 #11
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p-interp.lha
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p-interp-0.5
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TreeSearch.c
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2001-05-20
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/*
P-Code interpreter (to run the apple pascal system)
Copyright (C) 2000 Mario Klebsch
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
$Log: TreeSearch.c,v $
Revision 1.2 2001/05/20 13:12:02 mario
CVS-Idents und Logs eingefügt
*/
#ident "$Id: TreeSearch.c,v 1.2 2001/05/20 13:12:02 mario Exp $";
#include <stdio.h>
#include "psystem.h"
#include "Memory.h"
#include "Array.h"
#undef DEBUG
word csp_TreeSearch(word TokenBuf, word ResultPtr, word NodePtr)
{
word Link;
#ifdef DEBUG
int i;
for (i=0; i<8;i++)
putchar(MemRdByte(TokenBuf, i));
printf(": ");
#endif
while (1)
{
int cmp=ByteCmp(TokenBuf, NodePtr, 8);
if (cmp<0)
if ((Link=MemRd(WordIndexed(NodePtr,5))))
NodePtr=Link; /* follow RightLink */
else
{
#ifdef DEBUG
printf("not found, should be on right node\n");
#endif
MemWr(ResultPtr, NodePtr);
return(0xffff);
}
else if (cmp>0)
if ((Link=MemRd(WordIndexed(NodePtr,4))))
NodePtr=Link; /* follow LeftLink */
else
{
#ifdef DEBUG
printf("not found, should be on left node\n");
#endif
MemWr(ResultPtr, NodePtr);
return(1);
}
else
{
#ifdef DEBUG
printf("found\n");
#endif
MemWr(ResultPtr, NodePtr);
return(0);
}
}
}